I like the outside map with invis/berserk. idk what it's called, has a colour scheme like klondike though, and architecture like peak. It isn't claustrophobic like some of the more UT3-like maps. Lots of opportunities to set traps, some good arena rooms (rocket room for example), and since it's open you can really pressure your opponent when in map control.
GUESS THE NAME LOL IDK. I'll check later